40-500 Gas
July 27, 2018
5
If you have a full 12 volt DC power to coil and a good ground on white and green wires in gray
electric box copper ground lug, and it does not magnetize, replace coil. If the coils test good and
magnetize one at a time, by moving grout pump manual 3 position switch up or down, then
move on to the last step that very seldom ever fails.
The pilot valve in the hydraulic solenoid valve may be bad if the pump sticks to one side and will
not move.
Shut off engine and relieve all pressure on hydraulic system, grout pump and grout
line.
Take a ¾” end wrench and remove the coil nut
(36)
. Then using a 1” box end wrench
remove the pilot valves
(34)
on both ends of the solenoid valve and swap end to end. Replace
the coils, cleaning the shaft properly and apply never seize or grease. Do not over tighten the
nut that holds the coil in place, 60 in lbs. or 5 ft. lbs. torque.
If the grout pump piston now travels to the opposite end and sticks we now have diagnosed a
bad pilot valve. Replace as needed.
